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Reproduce a filed issue's screenshot headlessly (MATTER_REPLAY) and diff before/after PNGs with img_diff.py. Use when asked to verify a fix against a filed issue, or compare before/after screenshots of an engine change.
기본적으로 소스를 먼저 확인하는 Prompt가 선택됩니다. 직접 명령으로 전환하거나 로컬 사본을 다운로드할 수도 있습니다.
설치 여부를 결정하기 전에 SKILL.md와 SkillsMP에 표시된 보조 파일을 읽어 보세요.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
직접 명령은 검토 Prompt를 거치지 않습니다. 실행하기 전에 소스를 확인하세요.
npx skills add https://github.com/ElectricJack/matter-engine --skill qa-replay-diff명령은 한 줄로 유지됩니다. 복사하기 전에 가로로 스크롤해 전체 내용을 확인하세요.
로컬 사본을 원하시나요? SkillsMP에서 현재 제공할 수 있는 파일을 다운로드하세요.
Canonical build commands for MatterEngine3, MatterEditor, and their test suites, plus the exit-code and shader-propagation gotchas. Use when asked to build, compile, or rebuild the engine/editor.
Take screenshots of a MatterEngine world via MatterEngine3/tools/drive.py and a QA timeline (FIFO command file). Use when asked to capture a shot, screenshot, or visual check of a running world/scene.
Run the Vulkan smoke gate (12 fault/RT/VT modes) or a single MATTER_VK_SMOKE_MODE case against the editor's Vulkan build. Use when asked to run the smoke tests, the Vulkan gate, or verify a Vulkan/VT change didn't break validation.
SKILL.md 표시 중
| name | qa-replay-diff |
| description | Reproduce a filed issue's screenshot headlessly (MATTER_REPLAY) and diff before/after PNGs with img_diff.py. Use when asked to verify a fix against a filed issue, or compare before/after screenshots of an engine change. |
bash docs/baselines/capture-replay-baseline.sh <issue-dir> before.png [shot-index]
# ... make the engine change, rebuild ...
bash docs/baselines/capture-replay-baseline.sh <issue-dir> after.png [shot-index]
python MatterEngine3/tools/img_diff.py before.png after.png \
--channel-tol 16 --max-diff-pct 0.5
<issue-dir> is issues/<guid>/ (needs state.json); shot-index is
1-based, default 1. img_diff.py prints a MATCH/DIFF verdict and exits 1 on
DIFF or a framebuffer-size mismatch (viewport size follows the docked ImGui
layout, not a fixed resolution).
capture-replay-baseline.sh wipes projects/world_demo/.cache/<world>
before every capture — deliberately: the cache is content-addressed on the
world's JS source, not engine code, so a warm-cache replay after an
engine-only change silently reloads the old bake and reproduces the old
pixels, passing while proving nothing.
img_diff.py's defaults (--channel-tol 2 --max-diff-pct 0.5) are
calibrated for raster and are useless for RT shots: identical runs differ
on ~22% of pixels at tol 2 (denoiser grain). Use a per-shot calibrated gate
from docs/baselines/README.md's table (e.g. PomProofBrick: --channel-tol 16 --max-diff-pct 0.5, floor ~0.069%). More MATTER_REPLAY_SETTLE frames do
not reduce RT noise.
Camera/render state and the ImGui layout, not input or a tick history. DLSS
forces to Native. Streaming worlds depend on which sectors are resident.
Bakes are not bit-deterministic across builds (see root CLAUDE.md).
See docs/agent/issue-system.md for the full replay/issue-schema reference
and docs/agent/qa-cookbook.md recipe 5.